Random Factors On line ordering site for Filk and some hard to find Folk music. This is the place to go if you need a new filk fix and can't wait for the next con... they do mail order!
Firebird Arts and Music Folk music producer, another place to mail order your filk.
Prometheus Music A new filk producer- aiming at very high quality recording
OLGA The Online Guitar Archive. This has been driven mostly offline due to legal action from BMI and ASCAP; but there is a search engine here that gives access to all sorts of lyrics.
Elderly Instruments The best music store on the web.
Ivanhouse Not really there yet, but watch these guys!
My favorite music groups